Carnival Glass was largely given away or sold cheap, as you can see here, at carnivals. The booth reads FREE but I am sure they had some angle. It is also called "Goofus Glass" as the decoration was cheap and wore off, hence people felt it was goofy or that the seller had tried to "goof us" according to Wiki. It is highly collectable today, but according to me this real photo post card is far more scarce than goofus glass. Not only does it show the questionable source of the glass, it has a few sleazy carnies hovering around for the photo.